By adding the DOP stage 2 filter, you can turn the Dri-Eaz DefendAir HEPA 500 into a high efficiency three-stage air filtration unit, ready for any sensitive job requiring first-pass HEPA filtration.

When the DOP pre-filter is used in combination with the and the , the DefendAir HEPA 500 passes laboratory DOP testing conducted per ANSI standards and achieves an efficiency rating of 99.97% against oily aerosol particles down to 0.3 microns.

*Please Note: This filter formerly had a part # of DRI-F415.